2.698 out of 5 from 142 votes
One day, Doraemon and Nobita use the robotic cat's water simulation pump and goggles to fill the town with water and swim alongside countless beautiful fish. After spotting a shark the pair quickly return the fish to where they came from, not realizing that one rare deep-sea creature has been left behind. The following day, Nobita stumbles across a young girl named Sophia in his garden and proceeds to show her around town, but she's no ordinary girl, she's a mermaid princess! When Nobita and the gang proceed to visit her underwater palace, they learn of the lost legendary mermaid sword and decide to search for it; but little do they know that they aren’t the only ones looking for that particular hidden treasure...
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